JST (Japan Standard Time) (日本標準時 Nihon Hyōjunji or 中央標準時 Chūō Hyōjunji) – The standard timezone in Japan, and is 9 hours ahead of UTC, i.e. it is UTC+09:00. There is no daylight saving time, though its introduction has been debated several times. During World War II, it was often called Tokyo Standard Time.
Japan Standard Time is the same as Korean Standard Time, Indonesian Eastern Standard Time and Yakutsk Time.